Letter | Published:

Is the illusory triangle physical or imaginary?

Naturevolume 257pages219220 (1975) | Download Citation



MOST pictures of visual interest contain a large amount of detailed information. Studies have shown that a great deal of these data can be filtered out without destroying a subject's or a machine's ability to recognise even quite complex objects1–4. The resulting benefits are economy of memory store and considerable flexibility in the shape and detail of objects classified as the same.

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  1. 1

    Kabrisky, M., et al., Ergonomics, 13, 129–142 (1970).

  2. 2

    Ginsburg, A. P., thesis, AFIT, Wright-Patterson, AFB, Ohio 45433 (1971); IEEE Proc. NAECON, 283–290 (1971).

  3. 3

    Carl, J. W., and Hall, C. F., IEEE Trans. Comput., C-21-7, 785–789 (1972).

  4. 4

    Ginsburg, A. P., et al., Proc. Int. Conf. Cyber., (in the press).

  5. 5

    Gregory, R. L., Nature, 238, 51–52 (1972).

  6. 6

    Ginsburg, A. P., IEEE Proc. NAECON, 309–316 (1973).

  7. 7

    Campbell, F. W., in The Neurosciences (edit. by Schmitt, F. O., and Worden, F. G.), (MIT Press, Cambridge, Massachusetts, 1974).

  8. 8

    Sekuler, R., A. Rev. Psych., 25, 195–232 (1974).

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    Hubel, D H., and Wiesel, T. N., J. comp. Neurol., 158, 3, 267–305 (1974).

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    Ginsburg, A. P., Proc. Opt. Soc. Am. mtg, 1973 abstr. J. Opt. Soc., 64, 257 (1974).

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  1. Physiological Laboratory, Downing Street, Cambridge, CB2 3EG, UK



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